power function

I would like to find the answer to 0.8^4000 with approximately 5
significant figures (ie. x.xxxx X10^-yyyy)

But once the power factor exceeds a limit, the results are no longer
in signtific notation (MATLAB just displays 0)

Is there another way to a about it? I've tried 0.8^4000 as well as
power(0.8, 4000), which give the same result.

Thanks,
W
.

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